burrows



W. E. BURROWS.

VEHICLE JACK.

APPLlcAloN man APRA, 1920.

1,389,737. PatentedSept. 6,1921.

nmz 33 .35 34 uNiTeD STATES PirENT ori-uca.

WILLIAM E. BURROWS, 0F ST. JOSEPH, MISSOURI.

VEHICLE-JACK.

To all 'whom it may co'lwem:

Be it known that I, WILLIAM E. BUR- Rows, a citizen of the United States residing at St. Jo h, in thefcounty of uchanan and State o Missouri, have invented certain new and useful Improvements in Vehicle- J acks, of which the following is a specification, reference being had therein to the accom anying drawing.

y invention relates to improvements in that class of vehicle jacks which is used for lifting one corner of a vehicle, such as an automobile, a truck and the like; and the objects of my improvements are, first: to provide a simple, substantial and ellicient jack of this class by the use of which an object can be lifted to an extreme height 'by' parts which can be moved to a position in which they occupy the minimum amount of space, for transportation, packing and the like, second: to so construct and arrange the parts of a jack that they can be easily and quickly operated, and in which all of the movements of the parts are positive, thereby avoidin accidents arising from disengagement o the parts, or slipping of the same, which frequently cause injury to the operator and dama e tothe vehicle being lifted by the jack third: to so construct a jack of this class, that it shall be extremely light of weight, neat in appearance,and be cheap in cost of manufacture.

illustrated in the accompanying drawings, in which Fi re 1 is a side view of the jack, showing thi; parts closed in normal osition. Fig. 2 1s a vertical section on the ine 1 l, seen in Fig. 3, showing the parts of the jack fully extended and a portion of the operating lever broken away. Fig. 3 is a horizontal section on the line 2 2, seen in Fig. 2,

looking downward. Fig. 4 is a top view of,

the gear case cover, in detail. Fig. 5 is a top` view in detail of the cap of the jack. Fig. 6 is a horizontal section, on the line 3 3, seen in Fig. 2,1ooking` downward. Fig. 7 is a. section similar to ig. 6, on the linev 4 4, looking downward. i l

Referring to `Fig. 2, the cylindrically formed lower section 5, of the jack, is provided with a plurality of notches 6, which notchesarefformed inthe lower end of said section. II'he screw thread 7 which is of left formation, is formed on the inner sur- Specication of Letters Iatent.

Application flied April 8,

y Patented Sept. 6, 1921. 1920. serial No. 371,046.

1face gf said section, throughout its entire eferring to Fig. 7, the holding lugs 8 are formed on the periphery of the holding disk 9, through the center of which disk the sruare aperture 10 is formed. Said disk is p aced 1n the lower end of said bottom section 5, with said lu sin the notches 6. The base 11 of the jac Y is provided with the shoulder 11 formed therein. Said base is screwed onto said lower end of said section, tightly pressing said lugs in said notches, thereby holding said disk against rotation in said base.

A plurality of convolutions of the screw thread 12 is formed on the lower end portion of the outer surface of the middle section 13,- of the jack. Said thread is screwed between the convolutions of the thread 7, for raising said middle section from the position seen in Fig. 1, to the position seen in Fig. 2, by rotation of said middle section in one direction, and vice versa for lowering said middle section. The screw thread 14, of right formation, is formed on the inner surface of the middle section 13, throughout its entire length. A plurality of convolutions of the thread 15 are formed on the lower end portion of the outer surface of the upper section 16, of the jack, said thread being in engagement with the thread 14, for raising said upper section from its lowered osition, I attain these objects by the mechanism not shown, to the position seen in ig. 2, by rotation of the middle section 13, in one direction and vice versa for lowering said upper section.

The jack cap 17 is provided with the externally screw threaded plug 18, formed on its lower surface, and with the raised checkers 19, formed on its upper surface, the latter being for the purpose of holding an object, resting thereon, from slipping therefrom. Said screw threaded plug is screwed into the internally threaded upper end portion of the upper section 16.

The gear case 2() has an opening 20 formed through its bottom, which is passed over the upper end of the middle section 16, after which the ratchet wheel 21 is secured on the upper end of said section, in any well known substantial manner, such as swaging the upper extremity of said section onto said wheel, welding or brazing.

`The lower end portion of the pawl stud 22 is secured in the bottom of the gear case 20. The pawl 23 is oscillatably mounted on limb 24 is in engagement with the ,teeth of the ratchet wheel 21, for rotation thereby in one direction, of said wheel. Said pawl and its integrally formed vlimbs are yieldably` held in this position, by the spring 26, the

free end of which presses against the face 27, which is formed on the outer portion of said pawl. The yother end of said spring issecured on the inner surface of the adjacent end of said, gear case. h

The similarly formed pawl face 28 is shift- .ed into contact with the free end ofsaid spring by moving the shifting stud 29 from the 'end of the slot 30, in which it is shown in Fig. 4, to the opposite end of said slot. This movement of said pawl moves the free end of the limb 25 (see Fig. 3,) into engagement withvsaid ratchet teeth, and moves the pawl limb 24 from its said' engagement.

Said shifting stud is secured inthe outerV portion of said pawl and extends therefrom through said slot, which slot is formed through the gear case cover 31, which is secured on the upper edge of the gear case 20.

Referring to Fig. 2, the apertures 31" and 20 are respectively formed throu h said cover and Ygear case, the portions o which, bound said apertures are rotatably mounted on the hub 21 of the wheel 21.

Referring to Figs. 2 and 3, the bearings 32 are formed on the gear case 20, between lwhich bearings one buck-kneed end of the member 33, of the operating lever, is oscillatably mounted.

The other end of said member is buck knee connected with the lever member 34, (see Fig. 2,) by the buck-knee connections 35. The handle 36 (see Fig. 1,) is formedon the free end of the last mentioned member.

The squared end portion 37 of. the holding rod 37 (see Fig. 2,) is inserted in the aperture 10, in the holding disk 9, and isjse cured therein by the nut 38, which is screwed onto the threaded lower extremity of said,

rod. The spline keys 39 are secured in the upper end portion of said rod, and extend therefrom into the spline channels 40, which are formed in the inner surface of the-holding sleeve 41,A for slidably splining said sleeve on said rod.

2The upper end of said sleeve is similarly provided with the spline keys 42, whichextend therefrom, into the spline channels 43, which channels are formed in the inner surface of the upper jack section v16. Y

Said sleeveV and rod, together with their respective spline connections, form slidably splined holding means, whereby said upper section is held against rotation.

The shouldered termination of the lower end oit' the spline channel 40 and the similar termination 43 of the spline channel 43,

parts are such,

limit the upward movement of the sleeve 41 andthe section 16, thereby stopping further action of all of the parts of the jack.

The cap 17 is removed from the-upper j endy ofthe last mentioned section, and a lu` bricant is poured into the thus opened upper e-nd of said section, after which said cap 1s returned.

Said lubricant gravitates into and partially fills the lower section 5, for lubricating all of the screw threaded Vconnections to the ground, that the conventional jacky can not be placed beneath said axle, and that where large tires of extremely great, diameter are used the conventional jack canV not be raised high enoughto fill the require'- ments, hence the need of a jack of' wide scopein its-action. f A It will be understood that the size and proportions of the hereinbefore described that said' requirements are thereby fulfilled.

In operation,rwith the parts inthe posi'- tion seen in Fig. 1, the operator of the jack grasps the handle 36 and thereby moves the lever members 33 andl 34, fromr the position seen in said figure to the position shownin Fig. 2, after which he places the cap 17 'be-V neath the object to be thereby lifted. He then. draws said handle towardhim, which by the described pawl andY ratchet mechanism, rotates the middle section 13, clockwise. Y

This movement of Said section screws the same upward, by reason orl its leftfscrew threaded connection with the lower section 5. Y Y

While these movements are takingl place, the previously described section holding means holds the upper section 16 against rop The operator thereafter movesl said han-i dleifrom him, thereby recoverin Athe stroke. of said handle and the therewit connected pawl and'ratchet` movement. He then/repeats said movements of said handle, until said objectis lifted the desiredheight.

' When desired, said object is lowered in the following manner. Said operator moves the shifting stud 29 from the end of the slot 30, as seen in Fig. 4, to the opposite end of said slot, which moves the pawl 23, thereby mo the end of the pawl limb 24, from its s own engagement with the teeth of the ratchet wheel 21. This movement of said pawl moves the free end of the pawl limb 25 into engagement with said teeth, after which the springb 26 resses against the pawl face 28, there y yi dably holding the end of the last mentioned pawl limb in its described enga ment.

After this, the operator orces the handle 36 from him, which, by the last described pawl and ratchet mechanism, connected w1th said handle, rotates the middle section in the o posite direction, thereby lowerin it and t thereby operated parts, inclu mg the unshown revlously described ob'ect. He thereafter aws said handle toward im for recovering the last described stroke of said handle, and then repeats these operations until said object is lowered as much as desired. Further repeating of said lowering operations, moves the parts of the jack, from their described position, to the position shown in F 1.

When it is deslred to separate the parts of the `ack, the operator removes the cap 17 from the section 16, and removes the section 5 fromv the base 11, after which he removes the nut 38 from the rod 37. He now inverts said sections, after which, the sleeve 41 and the rod 37 avitate therefrom. Said sections are therea er separated by unscrewing their respective screw connections. By reversing these operations, the parts are again assembled.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a three-section jack; an upper section a middle section and a lower section of tubular formation the last mentioned section having holding notches formed in its lower end said per section having spline channels formed ongitndinally in its lnner surface, said u per section bein telescoped into said mid e section while t e last mentioned section is telescoped into said lower section; a base in which the lower end of said lower section is secured, said base having a shoulder formed therein; a disk having a uare aperture formed through the center t ereof; a plurality of holding lugs formed on the periphery of said disk, said lugs being in said notches for holding said disk against rotation; a holding rod having a square portion formed thereon; rod Secur\ in means whereby said rod is secured on said disk with said square portion in said square aperture; a plurality of spline keys secured in the upper end portion of said rod extending therebeyond a holdin sleeve havin a like plurality of spline channels forme lon itudinally in its inner surface, the extende portions of said keys bein in said channels; and a plurality of other sp ine keys secured in the upper end ortion of said sleeve said other keys exten ing therefrom into the spline channels of said up er section of said jack; the whole forming s 1dably splined holding means whereby said upper section is held against rotation.

2. A vehicle jack comprising; a lower section; a base for said section; a middle section; an u per section; a checkered cap secured on t e upper end of said upper section, said ca together with said jack being adapted to e laced beneath an object to be lifted there y; screw threaded connecting means whereby said sections are so connected that said middle and said upper sec` tions are simultaneously raised by rotation of said middle section in one direction and are lowered by opposite rotation thereof; slidabl splined holding means in the center of sai jack whereby said up er section is held against rotation; a ratc et wheel secured on the upper end of said middle section; said wheel being provided with teeth formed on the periphery thereof; a hub formed on said ratchet wheel; a gear case; a cover for said case secured on the latter, said cover and case bein rotatably mounted on said hub; a reversib e pawl oscillatably mounted in said case; a pair of pawl limbs formed with said pawl the free end of one of said limbs being in engagement with the teeth of said ratchet wheel for rotating the latter in one direction; pawl oscillating means whereby said pawl is manually oscillated thereby so moving said case; and an extensible operating lever foldably hinged on said gear case whereby said case and the therewith mounted pawl are manually oscillated for rotating said ratchet wheel and the therewith connected middle section in either direction.

In testimon whereof I affix m signature.

iXILLIAM E. BUl'tROWS. 

